This is basically the only scenario I'd be remotely okay with Lexie's death.

This is probably not medically accurate, but it's what I came up with.

Starts right after the season finale.

I don't own anything!

….

"Zona," Mark said softly. He squinted. The sun was just beginning to peek through the clouds.

"Yeah?" She asked softly. She gently shifted her body and tried to keep herself awake. Luckily the pressure of Mark's body had stopped the bleeding in her leg.

"I don't think I'm gonna make it," He said softly as he looked up at her. His face was pale and his eyes were bloodshot.

"Don't say that, Mark. You're going to fine. We're going to get help and you're going to go home to Sofia and Callie. You're going to watch our daughter grow up."

"My chest…" Mark began to have trouble breathing. "Feels like it's about to explode, indicating a massive hemothorax." He began to chuckle at the irony. Despite his heart problems earlier, he would go the same way Lexie had. His laughter turned into heavy coughing.

"No, don't say that. You're going to be okay." She said softly, tears forming in her blue eyes.

"Even if you… Were able to… Fix it… My heart isn't strong enough…" He said softly. He got a far off look in his eyes.

Arizona knew he was right. He had faced so many complications; his heart wouldn't be able to withstand the conditions they were currently in.

"Want me to call the others?" She asked softly. Tears fell down her dirt-streaked face.

"No, they really shouldn't move." He replied.

Arizona clutched his hand.

"Tell… Derek… He was good friend... Make sure… Meredith knows… She was a good sister to… Lexie." As he said her name, he gasped for breath.

"Of course," Arizona said.

"And tell Callie… I'm sorry." He said softly.

Arizona tearfully nodded.

"And tell Sofia… That I love her." He said sternly.

"Every day," Arizona said. Her voice caught.

Mark suddenly felt a strange, faintly content feeling come over him. He knew it was his time.

"Meant to be," He whispered, closing his eyes one last time. He left the cold, dark forest, filled with Arizona's screams and sobs just as the sun rose.

He opened his eyes to find himself in front of a door. The door that Lexie had come bursting though years ago, telling him to teach her.

He gently opened the door and saw her.

She stood in the middle of the room, no injuries. Looking absolutely breathtaking in a purple dress, with her hair flowing down her back.

He ran over and pulled her into a deep kiss.

They wrapped their arms around each other, finally together.

They were interrupted by several small voices.

"Mommy! Daddy!" Three young children ran out from behind the bed.

2 boys and 1 girl.

They ran towards Mark and Lexie and wrapped their arms around them.

Mark and Lexie tearfully looked at each other as their children embraced them.

"Come on! It's time to go!" Lexie's mom suddenly appeared in the hallway outside of the door.

"Grandma!" The children yelled excitedly as they ran towards her.

"Are you sure you don't want to go back?" Lexie whispered, pressing her forehead to his.

"This is where I'm supposed to be. We're meant to be." Mark said with a grin.

They linked hands and began to follow their children and Lexie's mother down the hallway, towards the light at the end of the tunnel.

…

A week after the plane crash, a funeral was held. They were buried together, where everyone knew they would want to be. The bottom of their shared headstone read "Meant to be." Arizona had suggested them because they were Mark's last words; no one knew Lexie had also said them.

As the coffins were lowered into the ground, the sobbing attendees found some comfort in knowing they would be together forever, just like they were meant to be.